deem something + noun/adj.|deem something to be something|deem (that)…(formal)(not usually used in the progressive tenses)to have a particular opinion about somethingsynonymconsiderThe evening was deemed a great success.I deem it an honour to be invited.She deemed it prudent not to say anything.They would take any action deemed necessary.Word OriginOld Englishdēman (also in the sense ‘act as judge’), of Germanic origin; related to Dutchdoeman, also to doom.